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Before working inside the tablet
About this task
CAUTION:
If ATEX label is missing or damaged, the system must not be repaired or recertified by the Service
Facility.
WARNING:
Repair must be performed by a IECEx Certified Service Facility to maintain IECEx certification.
To avoid damaging your tablet, perform the following steps before you begin working inside the tablet:
Steps
1. Ensure that you follow the
2. Ensure that your work surface is flat and clean to prevent the tablet cover from being scratched.
3. Turn off your tablet.
4. Disconnect your tablet and all attached devices from their electrical outlets.
5. Press and hold the power button while the tablet is unplugged to ground the system board.
NOTE:
To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically touching an
unpainted metal surface simultaneously as touching a connector on the back of the tablet.
6. Remove any installed ExpressCards or Smart Cards from the appropriate slots.
Safety precautions
The safety precautions chapter details the primary steps to be taken before performing any disassembly instructions.
Observe the following safety precautions before you perform any installation or break/fix procedures involving disassembly or
reassembly:
● Turn off the tablet and all attached peripherals.
● Disconnect the tablet and all attached peripherals from AC power.
● Disconnect all network cables, telephone, and telecommunications lines from the system.
● Use an ESD field service kit when working inside any tablet to avoid electrostatic discharge (ESD) damage.
● After removing any system component, carefully place the removed component on an antistatic mat.
● Wear shoes with nonconductive rubber soles to reduce the chance of getting electrocuted.
Bonding
Bonding is a method for connecting two or more grounding conductors to the same electrical potential. This is done by using a
field service electrostatic discharge (ESD) kit. When connecting a bonding wire, ensure that it is connected to bare metal and
never to a painted or nonmetal surface. The wrist strap should be secure and in full contact with your skin, and ensure that you
remove all jewelry such as watches, bracelets, or rings prior to bonding yourself and the equipment.
Electrostatic discharge—ESD protection
ESD is a major concern when you handle electronic components, especially sensitive components such as expansion cards,
processors, memory DIMMs, and system boards. Very slight charges can damage circuits in ways that may not be obvious, such
as intermittent problems or a shortened product life span. As the industry pushes for lower power requirements and increased
density, ESD protection is an increasing concern.
Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than
in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.
Two recognized types of ESD damage are catastrophic and intermittent failures.
● Catastrophic – Catastrophic failures represent approximately 20 percent of ESD-related failures. The damage causes
an immediate and complete loss of device functionality. An example of catastrophic failure is a memory DIMM that has
received a static shock and immediately generates a "No POST/No Video" symptom with a beep code emitted for missing or
nonfunctional memory.
12
Field service information
Safety
Instruction.
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